Agarttha is an imagined underground kingdom that characters describe as the hidden seat of the King of the World and the Masters of the World. In the novel, it is alternately a refuge for the Templars, a source of Eastern wisdom, and a model for conspiratorial explanations of history. Its importance lies not in confirmation that such a place exists, but in the way its shifting descriptions draw the characters’ investigations into an ever-expanding system of supposed connections.

The Hidden Kingdom in the Templar Narrative

Colonel Ardenti places Agarttha at the end of his account of the Templars’ supposed migrations. He claims that they left Europe for India with the Grail, and identifies Agarttha as their refuge and the origin of their spirituality. In his account, the kingdom is an underground center from which the Masters of the World direct human history, and the Templars maintain contact between Eastern and Western wisdom. He further links it to Synarchy, presenting the hidden kingdom as both a spiritual source and a political power.

Ardenti folds Agarttha into a larger chain of claims about sacred history. He says it was founded six thousand years earlier, at the beginning of the Kali Yuga, and that the Templars’ task has always been to preserve contact with it. The alleged route then leads from Provins to Chartres, which he identifies as the site of another meeting in a Druidic sanctuary. His explanation joins the Grail romances, the Crusades, Celtic Black Virgins, and the Benedictines into one supposed tradition. Agarttha gives that account a distant destination and hidden center, even as the succession of associations makes the argument difficult for his listeners to follow.

Saint-Yves and the Underground World

Later, Signor Salon invokes Agarttha while walking through subterranean passages. He reasons that if the Masters of the World exist, they must live underground, and names Saint-Yves d’Alveydre as the rare writer bold enough to describe their center. Salon presents the kingdom as the occult headquarters of Synarchy and suggests that people who reveal too much about it are eliminated. The tunnels around him become, in his suspicious interpretation, possible traces of the hidden order rather than merely passages beneath a city.

The novel also supplies a passage from Saint-Yves’s Mission de l’Inde en Europe, describing Agarttha as a mystic Zero among twenty-two temples in the Himalayas. The kingdom is said to be absent from the visible world yet to extend as a vast chessboard beneath almost every region of the globe. This image turns the underground city into a map-like structure: concealed, extensive, and capable of connecting distant places. After hearing Salon’s account, Casaubon, Belbo, and Diotallevi consider ordinary as well as conspiratorial explanations for the encounter, including that Salon might simply have known Ardenti or might have been a police informer. The scene leaves his claims unresolved.

A World Built Beneath the Surface

Salon’s account of Saint-Yves expands Agarttha into a detailed civilization. Beneath its underground cities live five thousand sages who govern the kingdom. A central dome receives surface light through mirrors and a spectrum distinct from the one described by conventional physics. Its inhabitants study sacred languages in pursuit of Vattan, a universal language; when faced with mysteries too profound, they are said to levitate and must be restrained by their companions. Salon also attributes to them the forging of lightning, the direction of terrestrial currents, and the creation of extraordinary animals. He concludes that Agarttha is probably where the Templars found refuge after their dispersion, where they continue their custodial work.

These particulars do not establish a stable account of the place. Instead, each detail extends the scope of the hidden kingdom, from geography and language to physics, zoology, and world history. When Casaubon asks whether Salon is serious, the question remains open. The narrative lets the elaborate description stand beside the group’s hypotheses and the possibility that Salon is an eccentric, not as verified knowledge but as material that can be incorporated into the Plan.

Conspiracy, Desire, and Interpretation

Agarttha’s underground setting makes it especially useful to characters looking for hidden causes beneath visible events. Salon argues that world rulers could only be underground; elsewhere, he transfers the same suspicion from the imagined kingdom to real tunnels and city subways, asking who chose and directed their construction. When he insists that the Templars are still underground, he relocates them from Agarttha into passages that might lie beneath Milan. The supposed refuge thereby becomes less a fixed destination than a flexible explanation that can be carried from one subterranean space to another.

A related explanation appears in a conversation about why people attribute events to cosmic plots. The claim that the world arose by chance is difficult for humanity to endure, so people posit God, angels, and devils; Synarchy, on a smaller scale, serves the same explanatory function. Agarttha belongs to this architecture of hidden agency: it gives a name and a dwelling place to powers imagined to direct history from below. The novel’s repeated return to the kingdom shows how a secret can acquire force through repetition and association, even when the evidence for it remains uncertain.

The same imagery enters Casaubon’s private reflections. He interprets his pursuit of underground passages and the pyramid of Isis through the Kabbalistic Sefirah Gevurah, associated in his account with fear and judgment. Looking back, he thinks he should have listened to Lia and recognizes that the desire for Sophia has drawn him toward a threatening world of demons. Agarttha is not simply part of Salon’s or Ardenti’s mythology in this passage: it has become one of the images through which Casaubon reads his own desires, making the supposed hidden geography an interior as well as a political landscape.

Narrative Significance

The kingdom’s recurrence also shows how the Plan absorbs new material. In a later conversation, Salon again asserts that the Templars remain in underground tunnels, while connecting the suspicion to the existence of the Milan metro. He points to the fact that the Jesuit Kircher’s book on the underground world also discusses alchemy and attacks the Rosicrucians, and treats this juxtaposition as evidence that the Jesuit knew about the Templars’ refuge. The leap from a book’s subjects to a hidden Templar presence exemplifies the Plan’s habit of turning proximity into proof.

Agarttha therefore functions as a powerful but unverified location: a place that can be set in the Himalayas, invoked as the source of ancient wisdom, or projected beneath contemporary cities. Its subterranean position gives conspiracy a spatial form, with visible life above and an imagined directing order below. As characters repeatedly connect it to other stories, the kingdom illustrates the seduction and danger of a system in which every new association appears to confirm the last.